Battery Eliminators, Power Packs and Mains Adapters etc. are names given to products that are made to provide a DC supply from the Mains Supply. Even in Equipment like a computer or radio a power supply block is required. Step down 50/60 Hz transformers are used to give isolation from mains and to obtain a lower voltage. SMPS designs are more popular as can give more power in a smaller size and dont heat up.
Mains Power Packs with 50Hz Transformers are still
popular for audio and some product safety sensitive
applications, as they are more isolated, reliable and
Power Supplies Section
- ideas on how Transformers are used in making Power Supplies
and Battery Chargers.
Low Frequency Power Transformers are used to step down mains
voltage of 230V or 110V to safer voltages like 12V and 6V. The
core is made of laminations of a Conditioned Alloy of Iron.
The windings are Enameled or Insulated Copper Wire. They
provide both Isolation and Safety while Scaling the Voltage
In Switch Mode Power Supplies the Transformers and Cores are
Coils Transformers in SMPS.
Wrong dot polarity in series connection just cancels the
voltage and a small residual imbalance voltage remains. If
wrong polarity connection is done in parallel, then a short
circuit or overload may occur.
Hysteresis - Charles Proteus Steinmetz - See how he made
the Hot Transformers and Motors Run Cool!.
Mains Adapter 230V AC 50 Hz to Rectified DC - How
is a small power transformer used to get DC.
This is when you need to build a symmetrical dual supply
like +12V and -12V supply for an opamp design. This is also
good for a two diode full wave rectifier. But when you make a
dual supply use a bridge and the center tap is ground.
If you use just two diodes then one winding may be loaded
more than other. That may not be good for long term
transformer life. The core may get magnetize.
20th May 2020
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